Concept 2 is a globally recognized brand known for manufacturing the best rowers. The Model D rower is the best selling rower in the world and highly recognized for its dependability. Professional and Olympic athletes train with the model D rower. This unit has a quick-release mechanism on the frame, allowing it to easily break-down into two pieces for convenient and easy storage and mobility. The chain is nickel-plated, which requires less oiling and maintenance. The adjustable foot-straps accommodate a large range of shoe sizes as well. This unit comes equipped with the PM3 monitor, which can be powered with two D-cell batteries and is compatible with Polar Heart Rate Equipment.